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The local institutional review board (IRB) and ethics committee (Medical Ethics Committee II Mannheim, Germany; reference number: 2013 566 N – MA) approved this prospective baseline study which was performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments.After the procedure was fully explained, written informed consent was obtained from all participants prior to MR imaging.

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Not applicable.

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The authors declare that they have no competing interests.

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